Nail brush



FIG. 1 is a top plan view of a nail brush showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an elevational view of the brush end thereof;

FIG. 5 is an elevational view of the handle end thereof. 

The ornamental design for a nail brush, substantially as shown and described. 